An Investigation of the Relationship between Subsurface and Head Waves by Finite Element Modeling

2016 ◽  
Vol 31 (4) ◽  
pp. 319-330 ◽  
Author(s):  
Mohamad Hasan Hojjati ◽  
Farhang Honarvar
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Element Modeling ◽  
Head Waves ◽  
The Relationship

scholarly journals Modeling indentation in linear viscoelastic solids

2004 ◽  
Vol 841 ◽  
Author(s):  
Yang-Tse Cheng ◽  
Che-Min Cheng
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Viscoelastic Properties ◽  
Viscoelastic Solids ◽  
Element Modeling ◽  
Elastic Plastic ◽  
Contact Depth ◽  
Linear Viscoelastic ◽  
The Relationship ◽  
Conical Indentation

ABSTRACTUsing analytical and finite element modeling, we study conical indentation in linear viscoelastic solids and examine the relationship between initial unloading slope, contact depth, and viscoelastic properties. We will then discuss whether the Oliver-Pharr method for determining contact depth, originally proposed for indentation in elastic and elastic-plastic solids, is applicable to indentation in viscoelastic solids.

Influence of Process Parameters on Electric Upsetting Process by Using Finite Element Modeling

2017 ◽  
Vol 728 ◽  
pp. 42-47 ◽  
Author(s):  
Pattarapong Nuasri ◽  
Yingyot Aue-u-Lan
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Material Flow ◽  
Electric Heating ◽  
Heating System ◽  
Forming Process ◽  
Influence Of Process Parameters ◽  
Element Modeling ◽  
Electric Upsetting ◽  
The Relationship

Electric Upsetting Process (EUP) is a process combining the forming process with the electric heating system. It is commonly used to manufacture a preform of a bar with high upsetting ratio, such as an axial shaft. The reliable forming process requires the understanding the effect of process and electrical parameters. Currently, the designer develops this process by trail-and-error. To successfully develop this process, the relationship between the electric heating and the forming parameters needs to be clearly understood. In this study, three parameters are investigated; namely anvil speed, upsetting load and heating voltage. Finite Element Modeling (FEM) is used as a tool for evaluating these parameters. The FEM results indicate that those parameters play significant roles on the material flow as well as the heating characteristics (i.e. temperature distributions and heat flow).

Finite Element Modeling of a Tennis Racket with Variable String Patterns and Tensions

1990 ◽  
Vol 6 (1) ◽  
pp. 78-91 ◽  
Author(s):  
Mary Ann Bitz Widing ◽  
Manssour H. Moeinzadeh
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Material Properties ◽  
String Tension ◽  
Tennis Racket ◽  
Element Modeling ◽  
Reaction Forces ◽  
String Pattern ◽  
Curved Elements ◽  
The Relationship

Finite element techniques were applied in a model of a tennis racket. Linear curved elements were used on the frame of the racket. Nonlinear cable elements were used on the strings. The model allows changing material properties and frame geometry, as do traditional models. Unlike traditional models, however, this model has the flexibility to change the string pattern and string tensions, as the strings are modeled discretely. Sample runs revealed information on the relationship between racket parameters and racket behavior such as deformations, stresses, and reaction forces. The results of the model showed that increasing string tension decreases racket deformation as string tension stiffens the racket. Increased string tension also decreases maximum hand reaction forces but increases stresses.

Finite Element Modeling and Simulations to Investigate the Relationship between the Cone Index Profile and Draft Requirements of a Compaction Profile Sensor with Depth

2018 ◽  
Vol 61 (1) ◽  
pp. 37-43 ◽  
Author(s):  
Qingsong Zhang ◽  
Shrini K. Upadhyaya ◽  
Qingxi Liao ◽  
Pedro Andrade-Sanchez
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Yield Criterion ◽  
Empirical Relationship ◽  
Cutting Edge ◽  
Soil Types ◽  
Element Modeling ◽  
Wide Range ◽  
The Relationship ◽  
Cone Index

Abstract. Previous research conducted using a compaction profile sensor and a standard cone penetrometer over a wide range of soil types and conditions found that the unit pressure acting on the cutting edge, defined as the cone index equivalent (CIE), at a specific depth (d) was related to the cone index (CI) value at that depth, the depth of the cutting edge (d), and the interaction between CI and the depth of the cutting edge (i.e., CI × d) with a very high coefficient of multiple determination irrespective of the soil type and conditions. The objective of this study was to provide an analytical basis for the relationship between CIE and CI. A two-dimensional axisymmetric model for soil-cone interaction and a three-dimensional model for soil-tine interaction were developed using a finite element method (FEM). A non-linear elasto-plastic constitutive behavior along with the Drucker-Prager yield criterion were used to represent the soil cutting process. Simulations studies were conducted in 25 distinct soil types and conditions, and the results indicated a similar relationship between CIE and CI, as observed in the previous research. These results support the existence of a strong theoretical basis for the empirical relationship observed in the previous research. Keywords: Cone index, Compaction profile sensor, Finite element modeling, Soil penetration resistance.

Exact First Order Finite Element Modeling for Eddy Current NDE

1991 ◽  
Vol 3 (1) ◽  
pp. 235-253 ◽  
Author(s):  
L. D. Philipp ◽  
Q. H. Nguyen ◽  
D. D. Derkacht ◽  
D. J. Lynch ◽  
A. Mahmood
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Eddy Current ◽  
Element Modeling ◽  
First Order ◽  
Eddy Current Nde
Sign in / Sign up

Export Citation Format

Share Document